Thursday: Talk on spring's best roses by Clair Martin, 2:30 p.m., to be followed by a sale of old English and modern roses, at the Huntington Botanical Gardens, 1151 Oxford Road, San Marino, (626) 405-2141. Free admission on this first Thursday of the month.

Saturday: Children's (ages 7 and up) workshop on bonsai, 9-11:30 a.m., at the Huntington Botanical Gardens, 1151 Oxford Road, San Marino, (626) 405-2141. $15 fee must be paid in advance and includes admission for one accompanying adult, plus a plant and pot.

Saturday and March 8: Winter Bulb Festival, coinciding with the peak bloom of the South African bulb collection, as well as a bulb sale, 10 a.m.-4 p.m. on Saturday, 11 a.m.-3 p.m. on Sunday, at UC Irvine Arboretum, corner of Campus Drive and Jamboree Road, UC Irvine, (714) 824-5833. $3.

Saturday and March 8: San Gabriel Valley Orchid Hobbyists' show and sale, 9 a.m.-4:30 p.m., at the Arboretum of Los Angeles County, 301 N. Baldwin Ave., Arcadia, (626) 447-8207. Adults $5; seniors and students $3; children $1.

Saturday and March 8: Five Cities Orchid Society show and sale, 10 a.m.-6 p.m. on Saturday, 10 a.m.-5 p.m. on Sunday, at the South County Regional Center, 800 W. Branch St., Arroyo Grande, (805) 928-2028. $1.